Maken no Hime wa Ero Ero desu: Himekishi no Hiwaina Kousoku

This story tells of the tsundere and reckless Princess Knight, Sheila Magnus who was the first daughter of the Kingdom of Macden. Teacher Sheila, named Nina, had trained her so well that no knight could compete with her swordsmanship. Sheila has a stronger her hobby that caused her fall. His curious and fearless personality brought him bad luck. The damned sword that was sealed in the treasure room made Sheila get a curse into lust for sex that was unbearable to make delusions about sex and the like.

(Source: Translated and Edited from Nekopoi)